A Wisconsin woman, once embroiled in a chilling criminal case involving the fictional character Slender Man, has gone missing. Authorities reported on Sunday that Morgan Geyser, who confessed to nearly fatally stabbing a classmate in 2014, has absconded from a group home after severing an electronic monitoring device.

Law enforcement in Madison has issued a public alert for the 23-year-old Geyser, last seen around 8 p.m. on Saturday accompanied by an adult acquaintance. The alert advised anyone who encounters her to call 911 immediately, emphasizing that she had removed a “Department of Corrections monitoring bracelet.”

Earlier this year, Geyser was relocated to a group home following a conditional release from the Winnebago Mental Health Institute. Her confinement there began in 2018, after she entered a guilty plea for attempted first-degree intentional homicide. This plea deal was part of an agreement with prosecutors, allowing her to avoid a prison sentence in favor of psychiatric treatment.

In response to this latest development, Geyser’s attorney, Tony Cotton, expressed uncertainty about her abrupt departure and implored her to surrender to authorities.

Geyser’s attorney, Tony Cotton, said Sunday that he did not know what happened with his client and urged Geyser to turn herself in.

“It’s in her best interest for her to turn herself in immediately and not continue with this course of action,” Cotton said in an Instagram video post where he addressed Geyser directly at times. “We don’t know any of the facts about what happened or who might have assisted her.”

Authorities say Geyser and her friend, Anissa Weier, were 12 years old when they lured their classmate, Payton Leutner, to a suburban Milwaukee park after a sleepover. Geyser stabbed Leutner more than a dozen times while Weier egged her on. Leutner barely survived.

The girls later told investigators that they attacked Leutner to earn the right to be Slender Man’s servants and they feared he’d harm their families if they didn’t follow through.

Slender Man was created online by Eric Knudson in 2009 as a mysterious figure photo-edited into everyday images of children at play. He grew into a popular boogeyman, appearing in video games, online stories and a 2018 movie.

Weier pleaded guilty to attempted second-degree intentional homicide. She was also sent to the psychiatric center and granted release in 2021.